Detailed code sharing about Python process control

1.while statement

Conditional loop control statement. Generally it needs to be used together with break, otherwise it will enter an infinite loop.

Format: [ while ：

                                                                                                                                                                                                                            

##Conditional control of process branches, generally used with elif and else.

x=int(input('请输入一个数字：'))while x>0:    print('正数')    break

For a simple if else statement, you can use ternary operation (ternary operation) to express

x=int(input('请输入一个数字：'))
if x<0:
    print(&#39;负数&#39;)
elif x==0:
    print(&#39;零&#39;)
else :
    print(&#39;正数&#39;)

3.for statement

Loop Control statements can be used to traverse an object and are used together with in.

Format: [for <> in